[zeromq-dev] thoughts on pub-sub messaging and "reliability"

Pieter Hintjens ph at imatix.com
Mon Oct 20 11:48:15 CEST 2014

OK, we agree to never use "QoS" in any ZeroMQ-related context :-)

On Mon, Oct 20, 2014 at 11:39 AM, Dorvin <dorvin at tlen.pl> wrote:
> W dniu 2014-10-20 10:50, Holger Joukl pisze:
>> Sadly and as often the case this term is used with multiple meanings
>> in different contexts, see e.g. the QoS definitions of the MQTT protocol:
>> http://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/MQTT_V3.1_Protocol_Specific.pdf
> There are lots of similar situations between groups (f.e. windows admins
> vs programmers vs networking guys). More funny is that these happen in
> one group, too. F.e. "trunk" means completely different thing with Cisco
> switches and HP switches. Since name "QoS" hasn't yet been popularized
> in 0MQ community and this is networking software it seems sensible to
> not get used to it in confusing context.
> The only thing you need to do about QoS is to tell your network admins
> to reserve you some bandwidth or complain about slow transfer and packet
> drops. :)
>> I don't know where the term first originated from but I agree
>> it's best to avoid confusion. So maybe "delivery guarantees" or
>> "reliability level" might be better words.
> Reliability sounds just fine. But use whatever suits you if it's not QoS. :)
> With regards,
> Jarek
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